Haptics not working correctly on Apple Watch Ultra Gen2

Ok, I have read more and more people with same experiences.

Just recently I bought a new AppleWatch Ultra Gen2.

Right from the start I noticed that the haptics are not working correctly. Some apps do give haptics on the watch, but some do not.

For example, receiving an iMessage triggers the haptics on my watch, receiving mail triggers the haptics on my watch, using a timer triggers the haptics.

However, receiving a WhatsApp; no haptics. I also use a sleep tracking app (Sleep Cycle) and the alarm in this app also does not trigger the haptic engine.

Funny thing is, for testing purposes I put on my old AppleWatch Gen4 and immediately received haptics on incoming WhatsApp messages.

I am on WatchOS 11.2 (22S101)

I am on iOS 18.2.1 (updated yesterday)

I already tried various tips and tricks but nothing seems to get the haptics going.

(restarted en reset both the watch and the phone; adjusted various settings like silent mode on or off, etc.)

The fact that it does work instantly on my old AppleWatch puzzles me even more.

But the fact that numerous people are reporting the same issues (although using other combinations of watches and iPhones) leaves me to believe there is a widespread problem with this.

l already filed a complaint with Apple, but if in the meantime someone comes up with a solution for this I would really appreciate it.